Radiotherapy impairs adhesive bonding in permanent teeth.
Juliana Arid1, Regina Guenka Palma-Dibb2, Harley Francisco de Oliveira3
1Department of Pediatric Dentistry, University of São Paulo-School of Dentistry of Ribeirão Preto, Avenida do Café S/N, Ribeirão Preto, SP, 14040-904, Brazil. juliana_arid@hotmail.com.
Summary
Radiotherapy (RT) significantly alters tooth enamel and dentin surfaces, weakening bond strength. The Clearfill SE Bond adhesive system performed better than Adper Single Bond 2, with restoration before RT showing the poorest outcomes.
Area of Science:
- Dental materials science
- Radiation oncology
- Biomaterials
Background:
- Head and neck cancer patients undergoing radiotherapy (RT) often experience oral complications.
- Understanding the impact of RT on dental restorative materials is crucial for patient care.
Purpose of the Study:
- To investigate the in vitro effects of RT on enamel and dentin morphology.
- To determine the optimal timing and adhesive system for dental restorations in patients receiving RT.
Main Methods:
- Enamel and dentin fragments from third molars were subjected to varying doses of RT.
- Restorative procedures were performed immediately before, immediately after, or 6 months after RT.
- Two adhesive systems, Adper™ Single Bond 2 (SB) and Clearfill SE Bond (CL), were evaluated.
- Confocal microscopy and shear bond strength tests were employed.
Main Results:
- Radiotherapy caused significant morphological changes in enamel and dentin, particularly at higher doses (60 Gy).
- The Clearfill SE Bond system demonstrated superior bond strength compared to Adper Single Bond 2.
- Restorative procedures performed immediately before RT resulted in the lowest bond strength for both substrates.
Conclusions:
- Radiotherapy adversely affects the morphological integrity of enamel and dentin, compromising adhesive bond strength.
- The Clearfill SE Bond system is recommended over Adper Single Bond 2 for dental restorations in RT patients.
- Timing of restoration is critical, with pre-RT procedures yielding the least favorable outcomes.
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